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The sum of the first ten terms of an AP is four times the sum of the first five terms, then the ratio of the first term to the common difference is
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1) An AP consist of 31 terms if its 16th term is m, then sum of all the terms of this AP is
2) 1,8,15,22,29,36,… is
3) In a certain AP, 5 times the 5th term is equal to 8 times the 8th term, then its 13th term is equal to
4) If the third term of an AP is 12 and the seventh term is 24, then the 10th term is
5) The sum of 5 numbers in AP is 30 and sum of their squares is 220. Which of the following is the third term ?